Teletypewriter



July 11, 1939.

c. J. FITCH ET AL TELETYPEWRITER 4 Sheets-Sheet 1 Filed Dec. 2, 1936ATTORNEYS.

J i 1939- v c. J. FITCH ET AL I 2,165,247

TELETYPEWRITER Filed Dec. 2, 1936 4 Sheets-Sheet 2 A TTORNILYS.

' F IE4.

July 11, 1939. v c. J. FITCH El AL 2,165,247

TELETYPEWRITER Filed Dec. 2, 1936 4 Sheets-Sheet 3 HIIM- 35% v INVENT RSTTORNEYS.

Jul 11', 1939.

Filed Dec 2, 1956 I FIG] F IG.7A.

FIG. 70.

C. J. FITCH ET AL TELETYPEWRITER' I FIG.7D, ",6

'FIGJE.

4 Sheets-Sheet 4 Mum s.

20 inafter set forth and claimed:

Patented July ll, 1939" TEIETYPEWRITEB cm. I. Fitch and Kurt n.Schneider, Endicott,

N. 1., assignors to International Business Machines (hrporation, NewYork, N. Y., a corporation of New York Application'necember 2. 1m.Serial No. 113,199

13 (ilaima. (c1. 178-23) This invention relates typewriters and moreparticularly to typewriters for use. as a receiving or recording unit inremote control systems such as for example printing telegraph systemsand 6 the like.

It isan object of the present invention to pro.- vide a simplified andpositive permutation bar system associated with the character keyboardof a typewriter and'adapted to operate a key bar l in accordance withthe permutation or combinational signals received thereby printing theselected character.

Various other objects and advantages of the invention will be obviousfrom the following particular description of oneform of .mechanism'embodying the invention or from an inspection of -the accompanyingdrawings; and the invention also constitutes certain new and usefulfeatures of 'construction and combination of parts here- In thedrawings:

' Fig. 1 is a cross sectional view of one type of poweroperatedtypewriter and the associated permutation bar unit. The crosssection of the said unit is taken along lines l-l of Fig. 2.

Fig. 2 is a plan'view of the permutation bar unit.

Fig. 3 is a detail view of the controlling clutch unit taken along lines2-! of Fig. 2.

' Fig. 4 is a detail view of the drive gears for the bars. Fig. 5 is anexploded view 'ot-a permutation bar clutch unit.

Figs. 6 to 6-3 are detailviews of the clutch unit.

Figs. 7 to 7--E are detail views of the permutation bars.

For illustrative purposes, this invention is shown as-embodying a wellknown form of rei cording unit, which may be the Electromatictypewriter, and hence requires only the following brief description.

Refen'ing to the drawings and particularly to Fig. 1, in the embodimentillustrated in the drawing. well known means are provided for actuatingthe type bars (not shown) by power operated devices comprisfng a powerdriven roller II.

A cam II .is pivoted on one arm of a bell crank lever l2 pivoted in theframe, the other arm of which is operatively connected with one arm of abell crank lever l2 by means of link H. The other arm of lever i3 isconnected to the type bars (not shown) in a well known manner.

' The lever I2 is actuated by the cam l I when the latter" engages thedriven roller ID to. be

operated thereby. The engagement of the cam I l with the power roller iscontrolled by means of the key lever I! in a manner which will now bedescribed.

The cam II is resiliently engaged by a springpressed arm which tends toturn it into enon-a lever 22 pivoted on the bell crank l2 and normallyarranged in the path of a lug on the .cam. When the lever 22 swings tomove its stop out of the path of the lug, the arm 20 swings the cam intoengagement with the power roller to be actuated thereby to swing thebell crank I! to actuate its connected mechanism.

The lever 22 has an arm 24 projects laterally through an opening in thebell crank l2 and engages the bifurcated lower end 26 of an arm 21 of akey lever l'l pivoted on the common rod 28.

It is obvious then that depression of a key lever i'l releases therevolubly mounted cam II to engage and be actuated by power roller 10 inturn operating bell crank 12 and its attached links to cause theassociated mechanism, such as the key bars and other operatingmechanisms, to be operated; v

The associated permutation bar mechanism will now-be described and byreferring to Figs. 1 and 2 is shown to comprise generally a plurality ofround slotted shafts or bars 35, the slots 26 of which are arrangeddiametrically opposite one another. The said bars are normallymaintained inoperative so that the control levers 21, one for each keybar and attached thereto, by link 31-41, are locked in an inoperativeposition.

Gear units 4| (Fig. 4) are provided at each end' of the' permutation bardevice, comprising three sets of gears, one foreach shaft or bar 35.Thegears 32, 39, and 4-0 are rotated continuously by drive gears 42 andare connected to the associated bars by individual clutches 43 (Fig. 5)to drive said 'bars one revolution. The clutches 43 are controlled bymagnets 44 which are energized by control signals and in combinations inaccordance with the perferred permutation code. During the rotation ofthe selected bars 35 certain slots 28 disposed thereon are presented.under the control levers 31 so that one control lever is selected andpermitted to drop in the channel provided by the slots which are inalinement, operating the control lever and its attached key bar lever,thus causing the character to be recorded.

hich is.provided L with an offset projection 25 at its end which'gagement with the power driven roller or stop 2| o -ported by members69 attached to the supporting casting it. Individual springs 5b areattached to the levers 3'! to urge the levers against the permutationbars 35. The levers 31 at the other ends thereof are linked to the keybar connecting links 31-41, and therefore it 'will be seen that upondepression of a control lever 31 by spring 5b the link 3'la will bemoved downwardly to lower the attached key'bar and causing theassociated type bar to be operated The levers 37 are kept I in correctalinernent by means of the comb member 56 attached to the saidsupporting casting.

The entire supporting casting id is pivotally secured to members 5i sothat the entire permutation bar unit may be rotated about the pivots 552(Fig. 2) by removing nuts 53. The pivot line through the hinges 52 is inline with the center of attachment of links 3l--a and levers 3i so thatthe said unit may be hinged downwardly without disturbing the linkconnections to the key bars.

The permutation bars are slotted in accordance with any desiredpermutation code, the slotted bars are shown in detail in Figs; 7 to7-E, the slots as shown are arranged so that upon rotation of certain ofthe bars, one control lever 3? is selected and permitted momentarily tobe depressed into the slots by spring 50 thereby depressing the attachedlink d'i-a and key bar ll. Referring to Fig. 1 it will be seen that therotation of bars Nos. 2, 4, and 6, will cause the slots of all the barsto be alined under the particular control lever 31 shown, therebypermitting said lever to be lowered into the slots momentarily todepress the associated link and key bar, causing the corresponding typebar to individual stud-shafts 56 (Fig. 5) upon which are mounted ratchetgears 57. Associated with each ratchet gear 51 is a clutch unit :33which is secured to the permutation bar '35. A clutch unit is providedfor each bar. The principles of operation of the sets of clutch unitsand gearunits are identical and consequently only one set need beexplained. It will be seen from Fig. 4 that the directions of motions ofthe clutch gears 38, 38,

and $03 are different, and because of this fact the clutches t3 are maderight-hand and" left-hand to correspond thereto.

A controlling magnet M is provided for each clutch 53. Referring toFigs. 3 and 5, the magnet' M is provided with an armature t8 secured toa clutch stop arm bl. The said arm, while the magnet M is deenergized,is adapted to engrease? as to receive the toothed dog 63. A spring post66 is fixed in the said member '65 and acts as a guide for spring 66.The dog 63 is shaped was to fit over the said spring and spring post andwhen mounted in the channel provided in the housing member 65 it is seenthat the spring 66. tends to urge or maintain the dog 63 to the right asviewed in Fig. 6A. The dog 63 and housing member 65 are recessed so asto receive the dog lift lever 62 which when inserted in the housingmember is adapted to be rotated slightly or pivoted about one endthereof. The other-end of the dog lift extends beyond the housing memherand is arranged to engage the stop arm 6| whenever magnet 44 isdeenergized. Movement of the dog lift lever 62 moves the recessed; dog63 and when blocked by the stop arm 6| asshown in Fig. 5 positions thedog 63 to the extreme left hand position against the actionof spring 66.I

. gagement and the path of dog lift lever 62. The

spring 66 then forces the dog 63 to the right as viewed in Fig. 5 intoengagement with the constantly rotating ratchet gear 5i.

The signal condition impressed upon/the magnet 64 lasts momentarily, sothat the stop BI is positioned 'in the path of the dog lift lever 62before one'revolution of the clutch has been completed. As the clutch isrotated by the gear 5? and completes its revolution the dog lift leverengages the stop 6i, and as the clutch continues its rotation with thelift lever 62 held stationary by the stop hi, the said lift lever isrotated about its end positioned in the housing member 65 to slide thetoothed dog 63 out of engagement with the ratchet gear 51. When thetooth 641s brought out of engagement with the said ratchet, drivingpoweris removed from the clutch and permutation bar. The spring 66within the dog 63 normally would have a tendency to rotate thepermutation bar in a reverse direction and permit the tooth lit to againengage the ratchetgear;

however, as previously explained the clutch and bar 35; are locked inthe inoperative position by means of the. stop 51. Due to the relativehigh speed of operation, when the toothed dog is forced out ofengagementwith the ratchet by means of the stop 6!, the momentum of the rotatingpermutation bar and clutch is sufiicient to rotate the bar and clutchslightly beyond theposition where the tooth 6% just becomes disengagedfrom the ratchet gear; this carry-over is sufficient to permit thespring-pressed stop 61 to engage the notch 63 locking the clutch and baragainst reversed rotation and insuring suflicient clearance between thedog tooth and the ratchet so as to prevent chattering.

The remainingpermutation bars are rotated in a like manner uponenergization of the associated clutch magnets 54. The magnets areenergized practically simultaneously so that when a particularcombination of signals-causes certain of the magnets to be energized,the corresponding permutation bars are permitted to be rotated onerevolution, permitting one control lever 3V to drop in. the alined slotson the permutation bars, thereby recording a character on the poweroperated typewriter accordintzly.

The design of the permutation bar unit should be such that the stroke ofthe lever 31 is about twice as great as necessary to operate thetypewriter key bar. In this manner the clutches are permitted a widemargin of operation and provides suflicient tolerance to allowforvariations in timing of the difierent magnets due to variations in timeof arrival of the signals. With reference to Fig. 1, it is seen thatwhen the permutation bars 2, I, and 6 rotate one revolution, the first90 thereof the levers 31 are all maintained in a locked position, thenext 90 permits the selected lever to be pull'eddownwardly by spring 50,the next 90 locks up all the levers again and during the last 90 thebars are positioned as shown in the normal position. It is seen,therefore, that upon reception of a signal the bars are rotated, buteven in this event all the control levers are maintained in a lockedposition except the selected one, in this manner making it impossible todepress more than one control lever and its associated key bar at atime. I

While there has been shown and described and pointed out the fundamentalnovel features of the invention as applied to a single modification, itwill be understood that various omissions and substitutions and changesin the form and details of the device illustratedand in its operationmay be made by those skilled in the art without departing from thespirit of the invention. Itis the intention therefore to be limited onlyas indicated by the scope of the following claims.

What is claimed is as follows: 1. A device of the character describedcomprising, in combination, a keyboard comprising a plurality ofoperable key bars, a plurality of rotatable permutation membersassociated thererotation of said members.

3. A device of the character described comprising, in combination, akeyboard comprising a plurality of operable key bars, a plurality ofrotatable permutation members, and means to rotate certain combinationsof said members simul taneously, including means to rotate the membersone revolution, and means to effect selection of certain of said keybars upon rotationof the permutation members.

4. A device of the character described comprising, in combination, aplurality of operable control members, a plurality of rotatablepermutation bars, electromagnetic means to control the rotation ofcombinations of said bars, and means to effect selection of certaincontrol members including means to effect said selection during therotation of said bars.

5. A device of the character described comprising, in combination, aplurality of operable control members, a plurality of rotatablepermutation bars, electromagnetic means to control the rotationofcombinations of said bars, means controlled by said electromagneticmeans upon momentary operation thereof to limit the rotation of saidbars one revolution, and means to eflect selection of a control memberincluding means to effect said selection during the rotation of thebars;

6. A device of the character described comprising, in combination, akeyboard comprising a plurality of operable key bars, individual controlmembers associated with each key bar, a pluralityof normally inoperativepermutation members, means to operate certain of said permutationmembers, and means to select a predetermined control member determinedby the positioning, of the permutation members including means to eifectthe said selection immediately upon positioning of the permutationmembers thereby effecting operation of the associated key bar.

7. A device of the character described comprising, in combination, akeyboard comprising a plurality of operable key bars, individual controlmembers associated with each key bar, a plurality of normallyinoperative permutation members, means to rotate certain of saidpermutation members a predetermined timed interval,-

plurality of operable key bars, individual control.

members associatedwith each key bar, a plurality of normally inoperativepermutation bars, and means to rotate certain of said bars onerevolution and means to select a certain control member during therotation of the permutation bars thereby effecting operation of theassociated key bar.

9. A device of the character described comprising, in combination, akeyboard comprising a plurality of operable key bars, individual con:trol members associated with each key bar, a plurality of normallyinoperative permutation bars, means comprising electromagnetic means tocontrol the operation of certain of said bars, and means to select acertain control member determined by the positioning of the permutationbars including means to eifect said selection during the positioning ofthe permutation bars thereby effecting operation of the associated keybar.

10. A device of the character described comprising, in combination, akeyboard comprising a plurality of operable key bars, individual controlmembers associated with each key bar, a plurality of normallyinoperative permutation bars, means adapted to rotate said bars, meanscomprising electromagnetic means, upon energization thereof, to renderthe rotating means eil'ective to rotate certain of said bars and meansto select a certain control member determined by the positioning of thepermutation bars and during rotation thereof thereby efiectingoperaeffect rotation of certain of the permutation members by thedriving means for a pre-determined timed interval; and means to efiectthe selection of certain of the control members during the rotation, ofthe permutation members.

prising in combination, a, group of normally inoperative rotatablepermutation members, a plurality of control members associatedtherewith, continuously rotating driving means, signal control means toeflect connection of certain of the permutation members to the saiddriving means,

thereby efiecting rotation of the said permutation members, and means toeffect selection of the control members during the rotation of thepermutation members.

CLYDE J. FITCH. KURT R. SCmiEIDE-R.

